body,html
    width 100%
    height 100%
    padding 0
    margin 0
    overflow hidden

body 
    padding 10px
    box-sizing: border-box

#modeBtn
    font-size 2rem
    float right
    border none 
    background transparent

.night
    background-color black
    color white

.light
    background-color  white
    color black
